Best 'how to' Add Meta Boxes/Custom Post Types Tutorial?

I wonder if anyone could help me out with what is the best tutorial/example to guide me through adding custom post type along within it specific meta boxes, which might include anything from WYSIWYG editor to just a check box or plain text?

I’ve found a few but they rarely tell you how to print said info from the meta box in your theme, just how to set up the admin area..

I would love to learn how to but struggling where to start off.

Any ideas?

Many thanks ??